Well with the tests best thing to do is do your research on this website and just practise as much of the material as you can that's what I did. With the interview have at least 2 answers ready for every question and the main ones to have good answers for are: why you want the job, whats good customer service, Health and safety means everything, Do your research on the company how many employees, MD etc and on the day have a few questions to ask them yourself ready aswell very important and good luck